* utils: Fix bertlv_encode_tag() for multi-byte tags
* pySim-shell: Include current logical channel in prompt
* pySim-shell: Add 'switch_channel' command
* Fix various mistakes around the CardADF <-> CardApplication dualism
* filesystem: fix various issues found by mypy
* filesystem: Avoid GPL header showing up in sphinx autodoc
* Use sphinx for generating documentation
* Add more documentation to the classes/methods